The recovery of algal biomass is one of the critical steps involved in the commercial production of beneficial metabolites from Arthrospira platensis. Efficient and safe harvesting methods that do not sacrifice quality of final product are important for commercial application. Phytic acid (PA) is a natural non-toxic phytochemical widely distributed in plant tissues. Effect of PA from rice bran on the growth, trichome morphology such as spiral number and algal filament length, and harvesting efficiency of A. platensis were investigated. Cells aggregated into large cell flocs after the addition of PA in the medium, and algal spiral number and filament length increased. UV-vis spectra indicated the interactions between PA and algal cells. Adding PA at stationary growth phase is a good strategy for harvesting, since no adverse effect to biomass growth and harvesting efficiency. Harvesting efficiency of 95.69% at 0.5% (v/v) PA was superior to other conventional harvesting methodologies.

Abbreviations

PA: Phytic acid; PUFAs: Polyunsaturated fatty acids; FAO: Food and Agriculture Organization; γ-PGA: Poly (γ-glutamic acid); CNF: Cellulose nanofibrils; NIES: National Institute for Environmental Studies; SOT: Spirulina–Ogawa–Terui; CG: Control group; pI: Isoelectric point.

中文翻译：

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用米糠中的植酸进行絮凝收获节肢动物。

藻类生物量的回收是商业生产节肢动物有益代谢物的关键步骤之一。不牺牲最终产品质量的高效安全的收获方法对于商业应用而言很重要。植酸（PA）是一种广泛分布在植物组织中的天然无毒植物化学物质。米糠中的PA对A. platensis的生长，线虫形态，螺旋数和藻丝长度以及收获效率的影响被调查了。在培养基中加入PA后，细胞聚集成大细胞絮凝物，藻螺旋数和细丝长度增加。紫外可见光谱表明PA和藻类细胞之间的相互作用。在固定生长期添加PA是收获的好策略，因为对生物量的生长和收获效率没有不利影响。在0.5％（v / v）PA下的收割效率为95.69％，优于其他常规收割方法。

缩略语

PA：植酸；PUFA：多不饱和脂肪酸；粮农组织：粮食及农业组织；γ-PGA：聚（γ-谷氨酸）；CNF：纤维素纳米纤维。NIES：国家环境研究所；SOT：螺旋藻–小川–特瑞；CG：对照组；pI：等电点。